Answer to Question #117064 in General Chemistry for johnny appleseed

Question

24.5 g of hydrofluoric acid are added to water to form an aqueous solution. what is the pH value of this solution if 30.0 L of water are used?

Answer 1

Molecular Weight of Hydrofluoric Acid =20gm

24.5 gm = (24.5/ 20) mole

= 1.225 mole

in 30 L of water 1.225 mole of hydrofluoric acid is present so the concentration will be

= 1.225/ 30

=0.04083 M

pH = -log[H+]

= -log [0.04083]

=1.4